对象的继承

时间：2015-03-29 22:07:15 收藏：0 阅读：104
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>

//继承 : 子类不影响父类，子类可以继承父类的一些功能 ( 代码复用 )

//属性的继承 : 调用父类的构造函数 call

//方法的继承 : for in :  拷贝继承 (jquery也是采用拷贝继承extend)

function CreatePerson(name,sex){   //父类
    this.name = name;
    this.sex = sex;
}
CreatePerson.prototype.showName = function(){
    alert( this.name );
};

var p1 = new CreatePerson(‘小明‘,‘男‘);
//p1.showName();


function CreateStar(name,sex,job){  //子类
    
    CreatePerson.call(this,name,sex);
    
    this.job = job;
    
}

//CreateStar.prototype = CreatePerson.prototype;

extend( CreateStar.prototype , CreatePerson.prototype );

CreateStar.prototype.showJob = function(){
};

var p2 = new CreateStar(‘黄晓明‘,‘男‘,‘演员‘);

p2.showName();


function extend(obj1,obj2){
    for(var attr in obj2){
        obj1[attr] = obj2[attr];
    }
}
</script>
</head>

<body>
</body>
</html>